Is this how you cut your driver side rear filler? I was planning to remove all the white part and then use fiberglass to on the backside to "glue" the gap closed.
Thanks for your tip on the flange. it went great, but now I really see what you mean about this cut.
It may need to taper more sharply towards the end. I compared five points on each filler (treating the passenger side as correct). There was almost 1/2" of difference at the first point, and there was no difference at the 5th point (the screw hole closest to the license plate)